| Different Plaster Types |
There are many different types of plasters, in Ireland the two main types are either gypsum based or cement based. The cement based plaster is generally used outdoors, applications such as rendering. The gypsum based plasters are generally applied indoors, care is required to protect against damp as this will attack a gypsum based plaster and cause it to crumble.
Cement based plasters can be used indoors for areas that are susceptible to damp and areas that require a greater thickness of cover.
Plaster Types
The most common gypsum plasters are browning, bonding, and metal lathing plaster. Modern plasters come already mixed with perlite, vermiculite and several other additives. These additives provide a greater degree of insulation and fire resistance. Other ingredients slow down the setting time and generally make the mixture more workable.
Today the only additive we need to add is good clean water. When plastering materials with differing absorption, it is a good idea to key the surfaces to be plastered with a PVA bonding sealer. This prevents the plaster 'going off' (setting) at different speeds.
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